14 documents found, page 1 of 2
Granulated biomass fly ash coupled with Fenton process for pulp and paper waste...
Ribeiro, João Peres; Cruz, Nuno C.; Neves, Márcia C.; Rodrigues, Sónia M.; Tarelho, Luís A. C.; Nunes, Maria IsabelThe work describes the combination of granulated biomass fly ash (GBFA) with Fenton process to enhance the removal of adsorbable organic halides (AOX) from pulp bleaching wastewater. At optimal operating conditions, wastewater's chemical and biochemical oxygen demand (COD and BOD5, respectively) and colour were also quantified, and operating cost of treatment assessed. For the first time, raw pulp bleaching was...
Biological barriers, processes, and transformations at the soil–plant–atmospher...
Avellan, Astrid; Rodrigues, Sónia M.; Morais, Bruno P.; Therrien, Benjamin; Zhang, Yilin; Rodrigues, Sandra; Lowry, Gregory V.The development of nanotechnologies for more sustainable agriculture is an innovative strategy proposed to increase food production while decreasing material inputs and reducing environmental impacts. Nanoparticles (NPs) applied to seeds, soil, or leaves interact with plants at two major interfaces: the rhizoplane (root–rhizosphere interface) or the phylloplane (atmosphere–leaf interface). NP transformations oc...
Dissolution of Ag nanoparticles in agricultural soils and effects on soil exoen...
Cruz, Nuno C.; Farto, Márcia; Mourinha, Clarisse; Tavares, Daniela; Duarte, Armando C.; Trindade, Tito; Pereira, Eduarda; Romkens, Paul F.A.M.To assess environmental risks related to the mobility and toxicity of AgNPs, the chemical availability of AgNPs and polyvinylpyrrolidone-coated AgNPs (PVP-AgNPs) in three agricultural soils was quantified in a pot experiment. Porewater collection and soil extractions with 0.01 M CaCl2, 0.4 M Glycine (pH 1.5) and 0.05 M NH4-EDTA were performed. The effect on soil exoenzyme activities was also assessed. Porewater...
Investigation of pore water and soil extraction tests for characterizing the fa...
Rodrigues, Sandra; Bland, Garret D.; Gao, Xiaoyu; Rodrigues, Sónia M.; Lowry, Gregory V.Here we compared the efficiency of Cu extraction (dissolved + particulate) from two soils dosed with CuO nanoparticles (NPs) at 50 or 250 mg kg-1 by pore water collection, and single- and multi-step soil extraction tests. Pore water collection recovered low levels of Cu (<0.18%, regardless of soil type or Cu dose). Single soil extraction by either CaCl2 or DI water led to higher Cu recovery than pore water coll...
Critical review: role of inorganic nanoparticle properties on their foliar upta...
Avellan, Astrid; Yun, Jie; Morais, Bruno P.; Clement, Emma T.; Rodrigues, Sónia M.; Lowry, Gregory V.There is increasing pressure on global agricultural systems due to higher food demand, climate change, and environmental concerns. The design of nanostructures is proposed as one of the economically viable technological solutions that can make agrochemical use (fertilizers and pesticides) more efficient through reduced runoff, increased foliar uptake and bioavailability, and decreased environmental impacts. How...
Harmonizing across environmental nanomaterial testing media for increased compa...
Geitner, Nicholas K.; Ogilvie Hendren, Christine; Cornelis, Geert; Kaegi, Ralf; Lead, Jamie R.; Lowry, Gregory V.; Lynch, Iseult; Nowack, BerndThe chemical composition and properties of environmental media determine nanomaterial (NM) transport, fate, biouptake, and organism response. To compare and interpret experimental data, it is essential that sufficient context be provided for describing the physical and chemical characteristics of the setting in which a nanomaterial may be present. While the nanomaterial environmental, health and safety (NanoEHS...
Composites of biopolymers and ZnO NPs for controlled release of zinc in agricul...
Martins, Natércia C. T.; Avellan, Astrid; Rodrigues, Sandra; Salvador, Diana; Rodrigues, Sónia M.; Trindade, TitoZinc deficiency is a widespread micronutrient deficiency problem affecting crops worldwide. Unlike conventional ionic fertilizers (Zn as salt or chelated forms), Zn-based engineered nanomaterials (ENMs) have the potential to release Zn in a controlled manner, reducing Zn losses through leaching upon application to soil. In this work, composites made of biopolymers (microcrystalline cellulose, chitosan and algin...
Effect of soil organic matter, soil pH, and moisture content on solubility and ...
Gao, Xiaoyu; Rodrigues, Sónia M.; Spielman-Sun, Eleanor; Lopes, Sónia; Rodrigues, Sandra; Zhang, Yilin; Avellan, Astrid; Duarte, Regina M. B. O.The objectives of this research were to quantify the impact of organic matter content, soil pH and moisture content on the dissolution rate and solubility of copper oxide nanoparticles (CuO NPs) in soil, and to develop an empirical model to predict the dissolution kinetics of CuO NPs in soil. CuO NPs were dosed into standard LUFA soils with various moisture content, pH and organic carbon content. Chemical extra...
Critical review of key variables affecting potential recycling applications of ...
Cruz, Nuno C.; Silva, Flávio C.; Tarelho, Luís A. C.; Rodrigues, Sónia M.Growing quantities of biomass ash are produced worldwide due to an increasing use of biomass for heat and electricity generation. Physical-chemical properties and elemental composition of ash at industrial biomass thermal power plants show significant variations. Experimental methods to characterize ashes are time-consuming and difficult to implement on a routine basis, posing severe limitations to the selectio...
Persistence of copper-based nanoparticle-containing foliar sprays in Lactuca sa...
Laughton, Stephanie; Laycock, Adam; von der Kammer, Frank; Hofmann, Thilo; Casman, Elizabeth A.; Rodrigues, Sónia M.; Lowry, Gregory V.Copper oxide and hydroxide nanoparticles (Cu-NPs) are components of some commercial pesticides. When these Cu-NPs dissolve in the environment, their size distribution, efficacy, and toxicity are altered. Since acute toxicity screens typically involve pristine NPs, quantification of the transformation of their size distribution in edible leaf vegetables is necessary for accurate consumer risk assessment. Single ...